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Integrated Impacts of Microplastics Contaminated Compost on Soil–Plant Systems and Bioaccumulation in Lettuce, Tomato, and Radish
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Researchers grew lettuce, tomatoes, and radish in soils amended with four composts of varying microplastic loads, finding that the most contaminated compost reduced early plant growth and resulted in bioaccumulation averaging 118, 81, and 140 microplastic particles per gram dry weight in the respective edible tissues. The study demonstrates that microplastics in compost-amended agricultural soil transfer directly into food crops, posing a direct pathway for human dietary exposure.
This study investigated the impacts of compost-hosted plastics and microplastics (MPs) on the growth and development of three economic crop varieties (lettuce, tomatoes, and radish) and assessed their bioaccumulation in edible parts under realistic environmental conditions. Four different composts, previously analyzed for their plastics and MPs content, were applied to the soil substrate to grow crops. Compost contaminated with the highest MP loads negatively impacted early plant growth, resulting in smaller overall plant size. Similarly, at the harvesting stage, the same compost exhibited the highest levels of free proline and total flavonoids in line with reduced plant growth. Photosynthetic pigment concentrations remained unaffected across treatments. Crop responses varied, with lettuce showing the most pronounced adverse effects across all growth stages. MPs were detected in edible plant tissues, with an average of 118 ± 136 particles g−1 dry weight in lettuce (leaf tissues), 140 ± 130 particles g−1 dry weight in radish (storage root tissues), and 81 ± 90 particles g−1 dry tissue in tomatoes (mature fruit tissues), as identified through Nile Red tagging and polymer analysis via micro-FTIR. Pyrolysis gas chromatography-mass spectrometry (Py-GC/MS) revealed an average MP mass of 2.2 mg g⁻1 dry weight in radish storage tissues. These findings suggest that MPs can accumulate in edible parts of vegetable crop species even during short-term cultivation periods, highlighting the need for further research on the long-term accumulation with risk assessment of human health and the adverse effects of MPs on yield loss in agricultural production.
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An 8-week pot experiment showed that microplastic type, size, and concentration produce species-specific, dose-dependent responses in lettuce and tomato, with tomato reaching 100% mortality at 10% concentration primarily because microplastics disrupted soil water-holding capacity rather than acting as direct chemical toxicants. This physical disruption mechanism means even low microplastic levels in agricultural soils may progressively degrade water availability for crops and threaten food security.
Microplastics in MSW-derived compost: release rate, characteristics, ecological risks, and mitigation strategies for sustainable agriculture
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Compost made from household trash often contains tiny plastic bits called microplastics, and surprisingly, the compost from industrial facilities had even more plastic contamination than the raw waste it started from. Since this compost gets spread on farm fields, these plastic fragments can build up in the soil where our food grows. The good news: simply sorting out plastic from food/organic waste before composting (rather than mixing everything together) dramatically cuts down on this contamination, suggesting better recycling habits at home and in waste facilities could help keep microplastics out of our agricultural system.
Microplastics in Soil-Plant Systems
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This review synthesized evidence on microplastic contamination in terrestrial soil-plant systems, examining effects on soil structure, nutrient cycling, microbial communities, and plant uptake of plastic particles. Because plants can absorb microplastics and translocate them into edible tissue, agricultural soil contamination represents a direct and underappreciated pathway of human dietary exposure to plastic particles.
The effects of different types microplastics on soil properties and the biochemistry of Chinese cabbage under different dosages and exposure times
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Microplastics from packaging and other plastic waste are building up in farm soils, and this study found that they can change soil quality and stress out crops like Chinese cabbage, altering nutrients, water content, and the plant's natural defense systems, especially at high concentrations. While this research looked at soil and plant health rather than testing the cabbage for human safety, it's a reminder that the plastic pollution we create doesn't just disappear, it may be quietly affecting the soil that grows our food.
Impact of Microplastic Contamination in Compost on Wheat Crop Growth: A Study of Bread and Durum Wheat Varieties
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Researchers inventoried microplastic content in commercially available compost and then exposed bread and durum wheat varieties to MP-contaminated growing conditions, measuring the effects on crop growth and raising concerns about microplastic transfer into the human food supply via agriculture.
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